#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <cmath>
using namespace std;
int v[100000];
int main(){
    int n,a,b,c;
    int tm0=0, tm1=0,sc1=0,sc0=0;
    cin>>n;
    for (int i=0; i<n; ++i){
        cin>>a;
        scanf(" %d:%d",&b,&c);
        v[b*60+c]=a;
    }
    for (int i=0; i<48*60+1; ++i){
        if (sc0>sc1) tm0++;
        if(sc1>sc0) tm1++;
        if (v[i]==1) sc0++;
        if(v[i]==2) sc1++;
    }
    printf("%02d:%02d\n%02d:%02d", (tm0/60), (tm0 % 60),(tm1/60),(tm1%60));
	return 0;
}